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Diffstat (limited to 'arch/powerpc/platforms/cell/interrupt.c')
-rw-r--r--arch/powerpc/platforms/cell/interrupt.c390
1 files changed, 0 insertions, 390 deletions
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
deleted file mode 100644
index 03ee8152ee97..000000000000
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ /dev/null
@@ -1,390 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Cell Internal Interrupt Controller
- *
- * Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org)
- * IBM, Corp.
- *
- * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
- *
- * Author: Arnd Bergmann <arndb@de.ibm.com>
- *
- * TODO:
- * - Fix various assumptions related to HW CPU numbers vs. linux CPU numbers
- * vs node numbers in the setup code
- * - Implement proper handling of maxcpus=1/2 (that is, routing of irqs from
- * a non-active node to the active node)
- */
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/export.h>
-#include <linux/percpu.h>
-#include <linux/types.h>
-#include <linux/ioport.h>
-#include <linux/kernel_stat.h>
-#include <linux/pgtable.h>
-#include <linux/of_address.h>
-
-#include <asm/io.h>
-#include <asm/ptrace.h>
-#include <asm/machdep.h>
-#include <asm/cell-regs.h>
-
-#include "interrupt.h"
-
-struct iic {
- struct cbe_iic_thread_regs __iomem *regs;
- u8 target_id;
- u8 eoi_stack[16];
- int eoi_ptr;
- struct device_node *node;
-};
-
-static DEFINE_PER_CPU(struct iic, cpu_iic);
-#define IIC_NODE_COUNT 2
-static struct irq_domain *iic_host;
-
-/* Convert between "pending" bits and hw irq number */
-static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
-{
- unsigned char unit = bits.source & 0xf;
- unsigned char node = bits.source >> 4;
- unsigned char class = bits.class & 3;
-
- /* Decode IPIs */
- if (bits.flags & CBE_IIC_IRQ_IPI)
- return IIC_IRQ_TYPE_IPI | (bits.prio >> 4);
- else
- return (node << IIC_IRQ_NODE_SHIFT) | (class << 4) | unit;
-}
-
-static void iic_mask(struct irq_data *d)
-{
-}
-
-static void iic_unmask(struct irq_data *d)
-{
-}
-
-static void iic_eoi(struct irq_data *d)
-{
- struct iic *iic = this_cpu_ptr(&cpu_iic);
- out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]);
- BUG_ON(iic->eoi_ptr < 0);
-}
-
-static struct irq_chip iic_chip = {
- .name = "CELL-IIC",
- .irq_mask = iic_mask,
- .irq_unmask = iic_unmask,
- .irq_eoi = iic_eoi,
-};
-
-
-static void iic_ioexc_eoi(struct irq_data *d)
-{
-}
-
-static void iic_ioexc_cascade(struct irq_desc *desc)
-{
- struct irq_chip *chip = irq_desc_get_chip(desc);
- struct cbe_iic_regs __iomem *node_iic =
- (void __iomem *)irq_desc_get_handler_data(desc);
- unsigned int irq = irq_desc_get_irq(desc);
- unsigned int base = (irq & 0xffffff00) | IIC_IRQ_TYPE_IOEXC;
- unsigned long bits, ack;
- int cascade;
-
- for (;;) {
- bits = in_be64(&node_iic->iic_is);
- if (bits == 0)
- break;
- /* pre-ack edge interrupts */
- ack = bits & IIC_ISR_EDGE_MASK;
- if (ack)
- out_be64(&node_iic->iic_is, ack);
- /* handle them */
- for (cascade = 63; cascade >= 0; cascade--)
- if (bits & (0x8000000000000000UL >> cascade))
- generic_handle_domain_irq(iic_host,
- base | cascade);
- /* post-ack level interrupts */
- ack = bits & ~IIC_ISR_EDGE_MASK;
- if (ack)
- out_be64(&node_iic->iic_is, ack);
- }
- chip->irq_eoi(&desc->irq_data);
-}
-
-
-static struct irq_chip iic_ioexc_chip = {
- .name = "CELL-IOEX",
- .irq_mask = iic_mask,
- .irq_unmask = iic_unmask,
- .irq_eoi = iic_ioexc_eoi,
-};
-
-/* Get an IRQ number from the pending state register of the IIC */
-static unsigned int iic_get_irq(void)
-{
- struct cbe_iic_pending_bits pending;
- struct iic *iic;
- unsigned int virq;
-
- iic = this_cpu_ptr(&cpu_iic);
- *(unsigned long *) &pending =
- in_be64((u64 __iomem *) &iic->regs->pending_destr);
- if (!(pending.flags & CBE_IIC_IRQ_VALID))
- return 0;
- virq = irq_linear_revmap(iic_host, iic_pending_to_hwnum(pending));
- if (!virq)
- return 0;
- iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
- BUG_ON(iic->eoi_ptr > 15);
- return virq;
-}
-
-void iic_setup_cpu(void)
-{
- out_be64(&this_cpu_ptr(&cpu_iic)->regs->prio, 0xff);
-}
-
-u8 iic_get_target_id(int cpu)
-{
- return per_cpu(cpu_iic, cpu).target_id;
-}
-
-EXPORT_SYMBOL_GPL(iic_get_target_id);
-
-#ifdef CONFIG_SMP
-
-/* Use the highest interrupt priorities for IPI */
-static inline int iic_msg_to_irq(int msg)
-{
- return IIC_IRQ_TYPE_IPI + 0xf - msg;
-}
-
-void iic_message_pass(int cpu, int msg)
-{
- out_be64(&per_cpu(cpu_iic, cpu).regs->generate, (0xf - msg) << 4);
-}
-
-static void iic_request_ipi(int msg)
-{
- int virq;
-
- virq = irq_create_mapping(iic_host, iic_msg_to_irq(msg));
- if (!virq) {
- printk(KERN_ERR
- "iic: failed to map IPI %s\n", smp_ipi_name[msg]);
- return;
- }
-
- /*
- * If smp_request_message_ipi encounters an error it will notify
- * the error. If a message is not needed it will return non-zero.
- */
- if (smp_request_message_ipi(virq, msg))
- irq_dispose_mapping(virq);
-}
-
-void iic_request_IPIs(void)
-{
- iic_request_ipi(PPC_MSG_CALL_FUNCTION);
- iic_request_ipi(PPC_MSG_RESCHEDULE);
- iic_request_ipi(PPC_MSG_TICK_BROADCAST);
- iic_request_ipi(PPC_MSG_NMI_IPI);
-}
-
-#endif /* CONFIG_SMP */
-
-
-static int iic_host_match(struct irq_domain *h, struct device_node *node,
- enum irq_domain_bus_token bus_token)
-{
- return of_device_is_compatible(node,
- "IBM,CBEA-Internal-Interrupt-Controller");
-}
-
-static int iic_host_map(struct irq_domain *h, unsigned int virq,
- irq_hw_number_t hw)
-{
- switch (hw & IIC_IRQ_TYPE_MASK) {
- case IIC_IRQ_TYPE_IPI:
- irq_set_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
- break;
- case IIC_IRQ_TYPE_IOEXC:
- irq_set_chip_and_handler(virq, &iic_ioexc_chip,
- handle_edge_eoi_irq);
- break;
- default:
- irq_set_chip_and_handler(virq, &iic_chip, handle_edge_eoi_irq);
- }
- return 0;
-}
-
-static int iic_host_xlate(struct irq_domain *h, struct device_node *ct,
- const u32 *intspec, unsigned int intsize,
- irq_hw_number_t *out_hwirq, unsigned int *out_flags)
-
-{
- unsigned int node, ext, unit, class;
- const u32 *val;
-
- if (!of_device_is_compatible(ct,
- "IBM,CBEA-Internal-Interrupt-Controller"))
- return -ENODEV;
- if (intsize != 1)
- return -ENODEV;
- val = of_get_property(ct, "#interrupt-cells", NULL);
- if (val == NULL || *val != 1)
- return -ENODEV;
-
- node = intspec[0] >> 24;
- ext = (intspec[0] >> 16) & 0xff;
- class = (intspec[0] >> 8) & 0xff;
- unit = intspec[0] & 0xff;
-
- /* Check if node is in supported range */
- if (node > 1)
- return -EINVAL;
-
- /* Build up interrupt number, special case for IO exceptions */
- *out_hwirq = (node << IIC_IRQ_NODE_SHIFT);
- if (unit == IIC_UNIT_IIC && class == 1)
- *out_hwirq |= IIC_IRQ_TYPE_IOEXC | ext;
- else
- *out_hwirq |= IIC_IRQ_TYPE_NORMAL |
- (class << IIC_IRQ_CLASS_SHIFT) | unit;
-
- /* Dummy flags, ignored by iic code */
- *out_flags = IRQ_TYPE_EDGE_RISING;
-
- return 0;
-}
-
-static const struct irq_domain_ops iic_host_ops = {
- .match = iic_host_match,
- .map = iic_host_map,
- .xlate = iic_host_xlate,
-};
-
-static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
- struct device_node *node)
-{
- /* XXX FIXME: should locate the linux CPU number from the HW cpu
- * number properly. We are lucky for now
- */
- struct iic *iic = &per_cpu(cpu_iic, hw_cpu);
-
- iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs));
- BUG_ON(iic->regs == NULL);
-
- iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe);
- iic->eoi_stack[0] = 0xff;
- iic->node = of_node_get(node);
- out_be64(&iic->regs->prio, 0);
-
- printk(KERN_INFO "IIC for CPU %d target id 0x%x : %pOF\n",
- hw_cpu, iic->target_id, node);
-}
-
-static int __init setup_iic(void)
-{
- struct device_node *dn;
- struct resource r0, r1;
- unsigned int node, cascade, found = 0;
- struct cbe_iic_regs __iomem *node_iic;
- const u32 *np;
-
- for_each_node_by_name(dn, "interrupt-controller") {
- if (!of_device_is_compatible(dn,
- "IBM,CBEA-Internal-Interrupt-Controller"))
- continue;
- np = of_get_property(dn, "ibm,interrupt-server-ranges", NULL);
- if (np == NULL) {
- printk(KERN_WARNING "IIC: CPU association not found\n");
- of_node_put(dn);
- return -ENODEV;
- }
- if (of_address_to_resource(dn, 0, &r0) ||
- of_address_to_resource(dn, 1, &r1)) {
- printk(KERN_WARNING "IIC: Can't resolve addresses\n");
- of_node_put(dn);
- return -ENODEV;
- }
- found++;
- init_one_iic(np[0], r0.start, dn);
- init_one_iic(np[1], r1.start, dn);
-
- /* Setup cascade for IO exceptions. XXX cleanup tricks to get
- * node vs CPU etc...
- * Note that we configure the IIC_IRR here with a hard coded
- * priority of 1. We might want to improve that later.
- */
- node = np[0] >> 1;
- node_iic = cbe_get_cpu_iic_regs(np[0]);
- cascade = node << IIC_IRQ_NODE_SHIFT;
- cascade |= 1 << IIC_IRQ_CLASS_SHIFT;
- cascade |= IIC_UNIT_IIC;
- cascade = irq_create_mapping(iic_host, cascade);
- if (!cascade)
- continue;
- /*
- * irq_data is a generic pointer that gets passed back
- * to us later, so the forced cast is fine.
- */
- irq_set_handler_data(cascade, (void __force *)node_iic);
- irq_set_chained_handler(cascade, iic_ioexc_cascade);
- out_be64(&node_iic->iic_ir,
- (1 << 12) /* priority */ |
- (node << 4) /* dest node */ |
- IIC_UNIT_THREAD_0 /* route them to thread 0 */);
- /* Flush pending (make sure it triggers if there is
- * anything pending
- */
- out_be64(&node_iic->iic_is, 0xfffffffffffffffful);
- }
-
- if (found)
- return 0;
- else
- return -ENODEV;
-}
-
-void __init iic_init_IRQ(void)
-{
- /* Setup an irq host data structure */
- iic_host = irq_domain_add_linear(NULL, IIC_SOURCE_COUNT, &iic_host_ops,
- NULL);
- BUG_ON(iic_host == NULL);
- irq_set_default_host(iic_host);
-
- /* Discover and initialize iics */
- if (setup_iic() < 0)
- panic("IIC: Failed to initialize !\n");
-
- /* Set master interrupt handling function */
- ppc_md.get_irq = iic_get_irq;
-
- /* Enable on current CPU */
- iic_setup_cpu();
-}
-
-void iic_set_interrupt_routing(int cpu, int thread, int priority)
-{
- struct cbe_iic_regs __iomem *iic_regs = cbe_get_cpu_iic_regs(cpu);
- u64 iic_ir = 0;
- int node = cpu >> 1;
-
- /* Set which node and thread will handle the next interrupt */
- iic_ir |= CBE_IIC_IR_PRIO(priority) |
- CBE_IIC_IR_DEST_NODE(node);
- if (thread == 0)
- iic_ir |= CBE_IIC_IR_DEST_UNIT(CBE_IIC_IR_PT_0);
- else
- iic_ir |= CBE_IIC_IR_DEST_UNIT(CBE_IIC_IR_PT_1);
- out_be64(&iic_regs->iic_ir, iic_ir);
-}